Telephone-transmitter



(No Model) Z. E. PATRICK.

TELEPHONE TRANSMITTER.

No. 543,313. Patented July 23,1395.

' f- INVENTOR ATTORNEYS WITNESSES:

UNITED STATES PATENT OFFICE.

ZORAH E. PATRICK, OF GHIOAGO, ILLINOIS.

TELEPHONE-TRANSMITTER. V

SPECIFICATION forming part of Letters Patent No. 543,313, dated July 23,1895.

Application filed Tamar-3718, 1895 Serial No, 535,412- (No model.)

To all whom it may concern: I

Be it known that I, ZORAH E. PATRICK, of Chicago, in the county of Cookand State of Illinois, have invented a new and useful Im from allhuskiness in the words, and also so constructed as to be free fromliability to derangement or depreciation. It consists in the combinationof two old features, one of which is a body of variable resistance, suchas a mass of carbon powder contained between two electrodes, and theother of which is a hollow vibratory body preferably in cone shape andof material which is electrically non-conductive, the. body of variableresist ance being mounted on the hollow vibratory support on its sidesin such a way as to permit said hollow body to transmit to the body ofvariable resistance only those vibrations of electrical value, andsuppressing or preventing by its peculiar trussed or braced shape allthose mechanical vibrations of excessive range or amplitude of movementwhich would interfere with the electrical transmission, as will behereinafter fully described.

Figure 1 is a perspective view of the simplest form of my invention.Fig. 1 is a sectional view showing it in connection with a mouth-pieceand a supporting-frame. Fig. 2 is a cross-section of Fig. 1 on the line2 2. Figs. 3, 4, and 5 are sectional details showing modifications ofthe carbon-filled box which forms the body of variable resistance, andFig. 6 is a perspective view of a modification of the invention in whicha cylinder is used instead of a cone.

In the drawings, A represents ahollow cone made of thin pasteboard,papier-mach, or other material capable of vibration from the impact ofsound-waves.

B are boxes of electrically non-conductive material mounted upon thesides of the cone and rigidly attached to it by glue or otherwise. Theseboxes have a filling f of pulverized carbon arranged between twoelectrodes 1) b of carbon or metal, which latter are connected to thecircuit-wires c 0. These boxes may be used singly, as in Fig. 6, or theymay be used in pairs, as in Fig. 1, connected by a wire d, and they maybe indefinitely multiplied and arranged either in series, as in Fig. 1,or each box may have its individual battery connection, as in Fig. 6.

In making use of my invention, I do not confine myself to any particularformor construction of the box B carrying the medium of variableresistance, nor the shape of the electrodes therein. Thus, for instance,the box may be cylindrical in form, as in Figs. 3 and 4:, and theelectrodes may be segments of a circle, as at b in Fig. 3, or be simplestems, as at b in Fig. 4. The box may also be square, as shown in Fig.5,and the electrodes be simple flat plates b or extensions of the WlIG. fIn supporting the cone I may arrange it either from a suspended supportor fasten it against a wall, as shown in Fig. 1. In the latter case thecone A will be surrounded by a case D, carrying binding-posts, withwhich the wires from the box 13 connect, and the cone is at its frontedge flanged and fastened to the case by a ring R with screws.Amouthpiece 0 is also by the same ring secured in front of the cone.

While the cone A is thepre'ferred form of support for the body ofVariable resistance, I

may in some cases use a cylinder A, as in Fig. 6, for this purpose. Inboth cases, however, the body of variable resistance is placed on theside Wall of its support and the electrical vibrations are taken offpractically at right angles to the direction of the transmission of thesound-waves. In my invention the cone, cylinder, or hollow support isnot employed for the purpose of gathering or collooting sound-waves, butis employed by reason of the fact that 'the transverse arch braces thehollow body against excessive vibration and breaks up or suppressesthose excessive mechanical vibrations which not cone is dividedlongitudinally and is neces sarily of metal and acts by induction, andbeing slotted longitudinally has none of the braced structure andspecial mechanical or acoustic value for which my cone is solelyemployed. I am also aware of the patent, No. 318,907, in which an outershell and an inner shell, both of metahhave a filling between them ofvariable-resistance material, the two metal shells being made aconductive part of the circuit. In my invention the cone is not a partof the circuit, is not necessarily made of metal, and is used only forthe purpose of supporting on its sides the box of variable resistance insuch a way as to allow only cer-, tain mechanical vibrations to beimparted thereto, and for this purpose the boxes of valiable resistancematerial are located rigidly on the side walls of the cone or hollowsupport, so that they get a vibration practically at right angles tothe-direction of transmission of sound-Waves, and as the cone is not.

used as a funnel for gathering the soundwaves said box of variableresistance may be placed on the inside of the side walls, as shown indotted lines in Fig.1, with nearly if not equal advantage.

Having thus described my invention, what I claim as new, and desire tosecure by Letters;

Patent, is

1. A telephone transmitter, consisting of a hollow vibratory shell abody of variable re-- sistance mounted rigidly upon the side walls;

of said shells, and an electric circuit passing through the body ofvariable resistance, the

said shell serving to support the body of vari-v able resistance, andtransmit modified me-. chanical vibrations thereto, but being wholly;without the electric circuit substantially as and for the purposedescribed.

2. A telephone transmitter, consistingof a hollow conical shell, a bodyof variable resistance mounted rigidly upon the side walls of the cone,and an electric circuit passing through the body of variable resistance,the said cone serving to support the body of variable resistance andtransmit modified mechanical vibrations thereto, but being whollywithout the electric circuit substantially as and for the purposedescribed.

3. A telephone transmitter, consisting of a hollow conical shell, a boxcontaining elec trodes and an interposed body of variable resistancemounted rigidly upon the side walls of the cone, and an electric circuitpassing through the electrodes and body of variable resistance, the saidcone serving to support the body of variable resistance and transmitmodified mechanical vibrations thereto,but being wholly without theelectric circuit substantially as and for the purpose described.

4. A telephone transmitter, consisting of the combination with aninclosing case; of a conical shell having its base fastened to the frontof the case, a body of variable resistance fixed rigidly upon the sidewall of the conical shell and within the inclosing case, and anelectrical circuit passing through the body of variable resistancesubstantially as and for the purpose described.

. riable resistance, a flanged mouth piece arranged in front of theconical shell, and a ring with clamp screws passing through and securingboth the mouth piece and conical shell to the case substantially as andfor the purpose described.

The above specification of' my invention signed by me, this 16th day ofJanuary, A. D.

1895, in the presence of two subscribing witnesses.

ZORAII E. PATRICK. \Vitnesses:

HERMAN W. SNOW,

EDWD. \V. BYRN.

